Printing telegraph apparatus



PRINTING TELEGRAPH APPARATUS Filed NOV. 14, 1955 .3 Sheets-Sheet l ALBERT H. REIBER L43 INVENTO'R PRINT svnm' ATTOR Y ISOCHIZONOUS CODE SIGNL sToP wcm/AL (vmzmeLE )OCNRONDUS 'CODE SIGNAL NOV. 28, 1939. A v|| RElBER 2,181,708

PRINTING TELEGRAPH APPARATUS Filed Nov. 14, 1935 3 lSheets-Sheet 2 FIG. 8

v mvENToR ALBERT H. REIBER BY FIG. 7 L|02 A'rToR Y NOV. 28, 1939. A. H, RElBER 2,181,708

PRINTING TELEGRAPH APPARATUS F'led Nov; 14. 1935 3 Sheets-Sheet 3 ATTORNEY Patented Nov. 28, 1939 UNiTED STATES PATENT oI-FlcE Albert I-I. Reiber, Evanston, Ill., assignor to Teletype Corporation, Chicago, Ill., a corporation of Delaware Application November 14, 1935, Serial No. 49,718

34 Claims.

The present invention pertains to printing telegraph' apparatus and more particularly to recorders responsive to isochronous code signals having a single selective current impulse.

The primary object of the invention is to provide a simple start-stop printer having a minimum of operating parts and operative under control of equal length code signals each comprising two elements of opposite signalling conditions whose time intervals are complementary, selective control being manifested by variation in the length of a-single line signal impulse in each received code signal.

According to the present invention, the line signal for each character consists of a no-current starting impulse and a current definitive impulse. Specifically, each code signal is composed of two elements, in which each element occurs but once in a code selective signal. In isochronous transmission, the sum of the lengths of the elements in each code signal is equal to unity, and although each element varies in length, nevertheless each element in each code signal is the complement of the other element of that particular code signal. Hence, each signal is formed and each character is determined by the relative lengths of the elements composing the signal.

When the starting impulse is received, a line relay or selector magnet deenergizes and releases its armature, permitting a type wheel to rotate. The type wheel rotates in phase with a transmitting element at the controlling station. During the rotation of the type Wheel, the receiving magnet, upon a reversal of signalling conditions 35 which occurs at termination of the starting impulse and the beginning of the contiguous dennitive impulse, attracts its armature and causes a printing hammer to operate to print a character. The printing may be accomplished while the type .10 wheel is rotating or the type wheel may through well known type segment aligning means he arrested momentarily while the print hammer is impressed against the type face. The type wheel aligning means may consist, for example, of a jockey or projection on the printing arm which engages with a type aligning toothed wheel to stop the type wheel momentarily, indexing for they proper character at the moment of printing. After printing has been effected, the type wheel is ,30 released and continues to rotate and is stopped as it completes one revolution.

The above and other objects of the invention will be apparent from the following-description y 'when taken in conjunction with the accompanying drawings, wherein like reference characters designate similar parts throughout the several views, and in which, I

Fig. 1 is a graphical representation of the type of code signal employed in operating the printer according to the present invention;

Fig. 2 is an elevational view of one form of the invention;

Fig. 3 is a top view of the form of the invention shown in Fig. 2;

Fig. 4 is a `cross-sectiona1 view taken on line 4-4 of Fig. 2;

Fig. 5 is a sectional View taken on line 5 5 of Fig. 4;

Fig. 6 is a perspective representation of the printing hammer employed in the structure shown in Fig. .2;

Fig. '7 is an elevational View of another form of the invention;

Fig. 8 is a top view of the form of the invention shown in Fig. 7;

Fig. 9 is an elevational view of a further form of the invention; and

Fig. 10 is a top view of the form of the invention shown in Fig. 9.

Having reference to Fig. l, there are indicated two monopulse isochronous code signals of the type employed in the selective control of printing apparatus according to the present invention. It is observed that the code signals according to this code are of uniform or equal lengths, that each code signal consists of two elements of opposite polarities or characteristics, and that each monopulse code signal comprises only a starting condition or impulse and a contiguous definitive condition or impulse. The instant at which the reversal of the current or characteristic nature of the impulses occurs is determinative of the identity of the character to be printed and is the instant at which printing is eiected. For example, the signal indicated at the left in Fig. 1 is representative of letter Nf and that at the right, of letter G. A description of the specific embodiments of the invention disclosed in Figs. 2 to 10 will afford a clear understanding of the application of monopulse isochronous code signals to printing telegraph receivers.

According to Figs. 2 and 3 a motor II and selector electromagnet l2 are mounted upon a base plate I3 and together with the major portion of the apparatus are housed by cover I4 and front plate I5. It is necessary that the speed of motor II be regulated so that the type wheel at the receiving station rotate in synchronism and in phase with the transmitting element at the transmitting station. Motor I I has mounted .0.11 its armature shaft i5 a pinion (not shown) which meshes with a gear il integral with the collar i8. Gear il and collar i3 are mounted for'rotation on a shaft i9 journaled in brackets 2l and 22. Also mounted on shaft i5 and having a spline connection with collar i8 is a collar 23 terminating at its forward end in a gear 23. Collars i8 and 23 and their respective gears il and 213 rotate continuously upon shaft i9 and impart rotational movement to shaft i3 at predetermined periods through the instrumentality of friction clutch means comprising friction discs 25 and 25 interposed between gears il' and 2a and a pair of flanged collars 2l and 28 secured to shaft i9. Pressure is exerted by gears l l' and 2li against collars 2'! and 28 by Virtue of a compression spring 29 restrained between one face of gear i1 and a nut 3i carried on collar 23. The pressure exerted by spring 2S may be adjusted by nut 3l and this adjustment maintained by a lock nut 32. There is inserted between collar 28 and bracket 22 a spacing collar 33.

Secured to shaft i9, adjacent bracket 22 opposite to collar 33 is a drivermernber '34 (Figs'B, 4 and 5l comprising an arm 35 disposed between a pair of resilient or spring members 3 5 and 3l. Spring members 36 and 3'! are U-shaped, each having one arm thereof riveted to member 34 and the extremity of the other arm disposed laterally as at 33 (Fig. 4) to embrace a stud 39 carried on a star wheel lil Star wheel 4l is integral with a collar l2 loosely carried on shaft i5 which collar terminates in a type wheel 43. The integral member comprising collar i2 and parts M and i3 is held loosely upon shaftl I9 by shoulder screw Lili. Upon initiation of rotation of shaft i9 through its frictional interconnection with gear il, rotation will be imparted to star wheel lil and type wheel 43 through the resilient-connection between springs 35 and 3l carried on arm 35 and stud 39 carried on star wheellll.

Arm 35 is Xed upon shaft i9 and springs 35 and 3l are Xed upon the hub-like portion of arm 35, Fig. 5. Body portions of springs 35 and 3l are bent into U-shape and are-positioned in part by riveting one leg of the spring to the hub portion of arm 35 and in part by pressing the distal end of each spring against the two sides of the arm 35, thus giving to each spring a defif nite position and definite location when at rest.

Pin 3G hired upon star wheel ii is positioned between two lateral extensions at the distal ends of the two springs 35 and 3'! and the loosely sleeved star wheel il is angularly positioned by joint action of the two springs, which act upon the pin 33 to keep it in alignment with the arm 35. Should wheel lll and pin 3S move out of this determined relative position, one of the springs 35 or 31 will be flexed and will tend to push the pin 39 to bring wheel il back into its proper angular position. Thefunctioning of the springs 35 and 3'? is as follows: When wedge 83, Fig. 6, is driven by printing arm @3 into a peripheral interstioe of star wheel si, the star wheelwill be in motion and may not be in accurate angular position for printing, correction of angular position for printing being effected by wedge 33 when entering an interstice of star wheel M. vShould star wheel iii be laggard at the printing instant, wedge 83 will advance it and propelfit into printing position in advance of the corresponding angular position of shaftmand arm 35, thereby moving pin 33 slightly with reference to position ofy arm 39 and therebyflexing spring 35. On the other hand, should the position of the star wheel 4l be in advance ofits desired printing position,

nection afforded by springs 35 and 3l between star wheel lil and power driven shaft l@ therefore constitutes a clutch which permits a small correction in angular position of star wheel di and printing wheel i3 by control of a minimum molecular mass without the encumbrance of the mass constituted by the shaft I9 and flanged collars 2l and 28 and also free from the driving power of clutch members 25 and 25, a much less powerful drive of spring 36 or 3'! being substituted for the full powered drive of clutch discs 25 and Since the function of introducing wedge 83 into peripheral interstice of star wheel di is effected by momentum or overthrow of hammer head the reduction of the value of mechanical resistance offered by star wheel 3i and type wheellfil to the corrective effort of ywedge 33 is of impor- A shaft 35 is journaled at one end in a bracket E and at the other end in plate' i5. Carried rotatably on shaft 45 and meshed. with gear t@ is a gear 4l provided with a collar 48 having a spline connection with another collar i9 also rotatable andv slidable on shaft i5 and provided with an integral disc portion 5i. be constantly rotated upon shaft i5 through gear 25. The assembly comprising'gear lil, collars i8 and i9 and disc 5I is adapted to be frictionally connected to shaft i5 through a pair of friction discs 52v and 53 disposed between a hanged collar 54 and ratchet member 55, both ixed to shaft i5 and embracing said assembly. Gear dl' and disc 5I are adapted to be pressed against discs 52 and 53 by means of a compression spring 55.

A pawl member 57 of U-shaped conformation to afford a substantial bearing on a stud shaft 59 carried by plate I5 is provided to` cooperate with ratchet 55 to control the spacing of printed tape subsequent to the printing operation. Pawl 51 is normallyv urged into cooperation' with ratchet 55'by means of a spring 5l. Pawl meinbe'r 57 is also provided with a portion '52 which coacts with a printing arm 63 pivotally carried at 64 on a` bracket 65. Also carried on pivot 45- is an armature assembly 65 having armature lever 6l cooperating with cores 63 of the selector magnetv l2, having a spring 63 with one end'con'- nected to armature assembly 56 constantlytending tourge the armature lever 6'! counterclockwise against an adjustable stop l'i carried in the bracket 35 and having also an'arm 'i3 which cooperatesl with a stop latch M, adjustably positionable for purposes of orientation'by means ofa slot'and screw adjustment l5. Latch arm M normally tends to rotate in a counterclockwise direction under theY action of a spring 'i6 into Gear 4l is adapted to the path of the arm 35. lThe biasing of arm i4 75 in a counterclockwise direction tends Vto rotate armature assembly 66 in a clockwise direction, thus assisting the magnetic pull of magnet lI2 upon armature 61.

The printing arm 63 is provided with a projection 11 to the end of which is connected lone end of a spring 18, the other end of which is secured to lever 61. Printing arm 63 normally tends to rotate in a counterclockwise direction about pivot 64, due to the action of spring 18, against an adjustable stop 19 carried on arm 61. The opposite extremity of printing arm 63 is conformed, as shown in Fig. 6, with a laterally disposed portion 8| terminating in a weighted printing hammer 82 which is disposed opposite the type on type wheel 43. Arm 8| is also provided adjacent to hammer 82 with a vertical projection 83 having a wedge shaped top edge which cooperates with the star wheel 4| to arrest momentarily the rotation of the type wheel 43 during the performance of the printing function. A tape 84 is directed between the type wheel 43 and print hammer 82 by mechanism which is well known and hence not shown. Secured to shaft-45 and disposed beneath tape 84 is atape feedr roller 85 and disposed above the tape and cooperating with the tape feed roller 'to effect the spacing of the tape is a pressure roller 86 which is` spring-biased against the tape by va spring (not shown). Positioned above the type wheel is an inking roller` 81 (Fig. 2) which is carried by a lever 88 pivotally carried on a stud shaft 89 affixed to plate I5. Inking roller 81 is normally biased into contact with type wheel 43 by a spring 9|.

General operation In the operation of the printer just described, the motor I I is constantly running through a local.source of power in phase with the transmitting apparatus, and gears I1, 24, and 41 are likewise constantly rotating. Shafts |9 and 45 ,however are restrained from rotation by the coaction of stop arm 35 and latch arm 14, and the coaction of pawl 51 and ratchet 55, respectively. The selector magnet I2, due to the fact that the nontransmitting condition of the line is normally a marking signalling condition, is energized, hence armature assembly 66 is held in its clockwise position, as shown in Fig. 2, and printing lever 63 is held against stop 19 by spring 18.

The operation of the printing apparatus to effect the printing of a character will be initiated by the reception of a starting impulse which is a reversal of the condition prevailing during the stop condition of transmission. In the specific form disclosed, current and noi-current operation is presumed, whereupon the reception of a starting impulse of no-current nature will cause the deenergization of the selector magnet I2, the effect of which will be to permit the counterclockwise rotation of armature assembly 66 due to the action of its spring 69. This rotation of assembly 66 will, through its arm 13, cause the clockwise rotation of latch arm 14 a sufficient amount to permit the stop arm 35 to escape its retention by latch arm 14, whereupon type wheel 43 and star wheel 4| will begin to rotate in a clockwise direction (as viewed in Fig. 2) until a reversal of the line signal condition occurs. The character to be printed is determined by the instant in the code signal interval at which a restoration of marking signal occurs. Thus, when the reversal of line condition occurs to determine the character to be printed, the energization of selector magnet |2 .will cause an attraction of assembly 66, the sudden rotation of which is imparted to printing lever `63, which is thereupon thrown against the type wheel to effect printing. The momentum imparted by assembly 66, through adjustable stop 19, to printing lever 63, causes lever 63 to stretch spring 18 so that the actual printing isl not performed by pressure applied directly to printing arm 63 by armature lever 61 but rather by the momentum given to lever 63 by armature lever 61 to accomplish what isknown as overthrow printing; that is, the printing is actually performed by the overthrow action imparted to hammer head 82 by printing lever 63. As printing lever 63 is thrown against the type wheel, the V-shaped projection 83 is also caused to engage a notch on star wheel 4| identifiable with the character to be printed, thus arresting momentarily the star wheel 4| and consequently type Wheel 43 so as to prevent blurred printing.

As the printing lever 63 is actuated sharply in a clockwise direction, this force is imparted also to the pawl 51 through the medium of projection 62. This action upon pawl 51 effects the disengagement of pawl 51 from ratchet 55 which is then permitted to rotate the angular distance corresponding to the pitch of one tooth, the pawl 51 being returned immediately by spring 6|. lThis angular motion of ratchet 55 is transferred to feed roller 85 which in conjunction with pressure roller 86 results in the feeding of the tape a distance of one character space.

After the reception of the stop impulse, the armature assembly 66 is held in its attracted position, thus permitting latching arm 14 to be returned to its counterclockwise position by its spring 16 in position to arrest the movement of arm 35 when the arm 35 has completed one revolution. In this manner the type wheel is stopped in its proper normal position and is rotated through one revolution upon the printing of each character.

Modification One modified form of the invention is shown in Figs. 7 and 8, and embodies the same principle as the form previously described, the structural adaptations being different. The apparatus for the most part is contained in a housing comprising the cover |0|, a base plate |02, and a front plate |03. A synchronous or speed regulated motor |04 is mounted on the base plate |03 and upon its armature shaft |05 is carried a pinion (not shown) which meshes with a gear |08 carried rotatably on a shaft |01, journaled in bearings |08 and |09. The gear |06 is provided with a hub portion which is connected through a tongue and groove connection to the hub IIZ of a disc II3. Disc ||3 and gear |06, as thus assembled, are frictionally connected to shaft |01 through friction discs ||4 and II5 disposed between said` assembly and a pair of flanged collars ||6 and ||1 xed to the shaft |01. Compressive force is imparted to friction clutch arrangement by means of a compression spring l 8 compressed between gear |06 and a nut ||9 threaded on hub I 2. The pressure of the friction clutch is adjusted by means of nut ||9 `and the adjustment is maintained by a lock nut |2I.

Fixed to the shaft |01 at its forward end is an assembly comprising a notched disc member |22, collar member |23, and a type wheel Also fixed to the shaft |81 adjacent to di'sc |22 is a sleeve |25 provided with a projecting arm I 26. Arm |26 cooperates with a shoulder |21 on an armature lever |28 pivoted at |29 to a i',

bracket |3| carried on frame |32. Lever |28 is provided with an armature |33 which cooperates with the core of a selector electromagnet |34. Armature lever |28 normally tends to rotate in a clockwise direction (as viewed in Fig. '1) in response to the action of a spring |35.

A printing control lever |36 is pvoted at |31 to front plate |63 and is provided with a shoulder |38 which cooperates with a cam roller |36 carried on a stud |4| on disc |22. Lever |36 is provided with an extension |42 which cooperates with a printing lever |43. Lever |43 is provided with a vertical arm |44 terminating in a lateral tip |45 which cooperates with the hooked eXtremity |46 of armature lever |28. Printing lever |43 is also provided with an arm |41 which terminates in a V-shaped point adapted to cooperate with a series of V-notches formed in the outer periphery of disc |22. Carried on the arm |41 near its extremity is a stud |48 which carries a printing roller |49. Appro-priately positioned on printing lever v|43 below roller |46 is a stud |5| with which the extension |42 of control lever |36 cooperates. suiciently to permit the tape |52 to be directed around it and thence around printing roller |49, as shown in Fig. '7.

Printing lever |43 is valso provided with an arm 53 upon which is carried a resilient member |54 which acts as a feed pawl to cooperate with a tape feed ratchet wheel |55 carried on a stud |56 mounted on the front plate |83. Integral with ratchet |55 and also mounted for rotation on stud |56 is a tape feed roller |51, and disposed above the tape feed roller and adapted to coact with the opposite side of the tape is a pressure roller |58 carried on a lever |56 pivoted at |6| to front plate |63. A spring |62 acts to rotate lever |59 in a clockwise direction to impart pressure between rollers |58 and |51. A detent member |63 is mounted upon fro-nt plate |03 and appropriately positioned to coact with the teeth on ratchet wheel |55 to prevent back spacing of the tape. There is' connected to the vertical arm |44 of the printing lever |43 a printing spring |64, which acts to rotate printing lever 43 so that printing roller |49 will engage a type face on the type wheel |24 and roll therewith to effect printing. The printing mechanism in this form of the invention is electro-mechanically controlled, that is, a latch mechanism normally acting to hold the printing mechanism against operation is controlled by the selector magnet, and when released permits the operation of theV printing mechanism by solely mechanical means.

Operation of modified structure In describing the operation of the structure shown in Figs. 7 and 8 it is assumed that 'the motor |64 is constantly running and hence gear |06 is rotating continuously on shaft |61 and imparts to said shaft continuously a tendency to rotate through the frictional connection therewith. Shaft |61, however, is prevented from rotating by the cooperation of stop arm |26 with shoulder |21 of armature lever |28, itbeing understood that the stop condition of the line is marking current and hence selector magnet |34 remains energized. While arm |26 is so arrested, the roller |39 on disc 22 is so positioned as to cooperate with shoulder |38 of control lever |36, which through the cooperation of its extension |42 with stud |5| holds the printing lever |43 in its clockwise position, as shown in Fig. 7.

Upon the reception of a starting impulse, the

Stud |5| also extends outwardly y selector magnet |34 is deenergized and the armature lever |28 is rotated suddenly in a clockwise direction by its spring |35. The rotation of armature lever |28 effects the disengagement of shoulder |21 from stop arm |26, thus initiating the 'rotationfof disc |22 'and type wheel |24. The rotation of armature lever' |28, however, is limited'by the lateral portion |45 of arm |44, thereby effecting the engagement of portions |45 and |46. As disc |22 begins to rotate, roller |36 becomes disengaged from shoulder |38 and hence printing arm |43 would be free to respond to the action of its spring |64 but for the engagement of portion v|45 with end |46 of armature lever |28. The printing mechanism thus is held in a state of suspension until the definitive printing signal is received. As previously described in connection with the rst form of the invention, the time at which the reversal of current or signalling conditionA occurs between the start and stop impulses is determinative of the character to be printed. Therefore, upon the receipt 'of the stop impulse or at the instant of reversal of current or signalling condition, the selector magnet |34 becomes energized thereby attracting armature lever |28 against the action of its spring |35 and causing the disengagement of extremity |46 from tip |45; Printing arm |43 is thereupon permitted to respond to the action of printing spring |64 which causes printing arm` |43 to rotate in a counterclockwise direction (as viewed in Fig. 7). As printing arm |43 begins to rotate, the V- lshaped extremity of arm |41 may engage with the periphery of disc |22 and'then cooperate voith y a notch in the periphery of disc |22 corresponding to the character to loe-printed, the position of said notch with relation to the type faces on the wheel being so related as to properly time the printing operation. Thus in this manner the lever |43 becomes geared to the disc |22 until the point of lever |43 by its arcuate path disengages itself Vfrom disc |22, andthe speed of movement Aof the printing lever |43` to print is controlled by the rotational movement of disc |22, and as lever |43 thus rotates with disc |22 in timed relation therewith, the printing roller |46l is caused to roll upon thel selected type face of the type wheel |24, the tape |52, of course, being disposed between the printing roller |49 and type wheelV |24. No inking arrangement is shown but any suitable form of inking roller or equivalent is intended. As the printing arm |43 is rotated to eiect the printing operation, the pawl |54 acts to yrotate the feed ratchet wheel |55, and hence the tape feed roller |51, one step or character space. After the printing of the character, the printing arm |43 remains temporarily in its counterclockwise position while the type wheel |24, disc |22, and stop arm |26 continue in their cycle of vrotation until stop arm |26 is again arrested by the shoulder |21 of the actuated or attracted armature lever |28. Immediately prior to the termination of the interval of cyclic time whence the stop arm |26 is arrested by shoulder |21, a

long low arc |65 in the periphery of disc |22 is presented to the point of arm |41 thus clearing the path for restoration of arm |41, and a typeless arc |66 is presented at the same time to the tape |52, whereupon the roller |39 functions to cam the printing control lever |36 downwardly, and extension |42 acts upon stud |5| to rotate the printing lever 43 clockwise against the action of printing spring |64. In this position or condition the printing arm and armature lever and. themembers carried on lshaft |61 assume their respective positions indicated in Fig. 7 until the reception of the starting signal of a succeeding character code signal.

Second modification Another embodiment of the invention is illustrated in Figs. 9 and 10 and embodies a different form of electro-mechanical printing mechanism. In this particular form of the invention, a toggle printing means is employed which is actuated mechanically by a printing spring to elect printing and which is restored mechanically, the selector magnet acting only to control a latching means for the printing mechanism.

Having reference to Figs. 9 and 10, a synchronous or speed regulated motor |1| is mounted on a base plate |12 and carries on its armature shaft |13 a pinion gear (not shown) which meshes with a gear |14 loosely mounted on a shaft |15 journaled at one end in a bracket |19 and at the other end in a front plate |11. Gear |14 is frictionally connected to shaft |15 by means of a friction clutch comprising a pair of discs |18 and |19 of friction material, a pair of flanged collars |8| and |82, and a compression spring |83. Fixed to the forward end of shaft |15 are a type wheel |84, a star wheel |85, and a stop disc |83. A gear |81 is also xed to shaft |15 and meshes with a gear |88 fixed to a collar |9| mounted on a shaft |89 journaled in a bracket |92 and front plate |11. Also integral to collar |9| is a disc |93 provided with spaced studs |90, which act to restore the toggle printing mechanism to its latched position Ishown in Fig. 9.

A selector electromagnet |94 is mounted on a bracket |95 fixed tothe front plate |11 and controls an armature assembly 290 in the form of a bell crank pivoted at |99` and having one arm 91 carrying an armature |98 cooperating with the core of the selector magnet |94. The other arm 99 of assembly 200 coacts with a projection 20| on disc |39 to hold shaft |15 against rotation. Arm |91 terminates in a laterally disposed portion 202 which cooperates with an escapement assembly comprising a lug 235 on a toggle link 205 and a hook end of a latch member 293 pivotally carried at 204 on arm 205 of link 206 of the toggle printing mechanism comprising a toggle lever 201 pivoted at|208 to a bracket 209 mounted on the front plate |11. Link 200 is also pivoted upon a printing arm 2|| pivoted at 2|2. Printing arm 2|| is provided with a laterally disposed platen portion 2| 3 which coacts with the type wheel |94, and a vertical projection 2|4 which coacts with the star wheel |85 to index for the proper character to be printed.

Link 299 and toggle lever 201 are pivotally articulated at 2|5, on which pivot is also carried one end of a restoring member 2|6, the other end of which is provided with a slot cooperating With a stud 2|1 mounted on front plate |11. Each stud |90 mounted on the face of disc |93 coacts with an offset portion 222 (Fig. 10) on link 2 I9 to effect the restoration of the toggle printing mechanism and the latch 293 to their positions shown in rig. 9.

when bell crank 224 rides off of the high portion of cam 223, spring 22B acts to rotate bell crank 224 quickly in a clockwise direction to advance ratchet wheel 221 one angular step. A spring actuated detent pawl 23| holds ratchet wheel 221 against slipping backward. Fixed to the outer end of shaft 2| 9 is a tape feed roller 232, and cooperating with roller 232 is a spring actuated pressure roller 233.

Operation of modified structure In operation, the motor |1| is running continuously through a local source of power in phase with the transmitting apparatus, thereby imparting constant rotation to gear |14. Shafts |15 and |89 are restrained against rotation by the engagement of stop lug 29| with arm |99 of bell crank 200, due to the energization of selector magnet |94. The toggle printing mechanism is latched preparatory to effecting printing by engagement of latch 293 With arm |91 of assembly 200. At the commencement of the starting impulse, the selector magnet |94 becomes deenergized, thereupon permitting assembly 299 to respond to its spring 234 to cause the disengagement of arm |99 from stop lug 29| to initiate the rotation of shaft |15, and to effect simultaneously the disengagement of arm i 91 from latch 293. Lateral portion 202 of arm |91 upon riding oit of latch 203 engages a lug 235 on toggle link 299 due to the stepped relation between lug 235 and the hook shoulder on latch 293. Shaft |15 upon rotation also effects the rotation of shaft |89 through gears |81 and |88, which in the embodiment shown permit one-fourth revolution of shaft |89 for each complete revolution of shaft |15.

At the instant of reversal of the signalling condition, Which is the point at which printing is effected and is determinative of the character to be printed, the selector magnet |94I again becomes energized and rotates assembly 299 in a counterclockwise direction against the action of spring 234 to return arm 99 into the path of stop lug 20|, and also to disengage portion 292 of arm |91 from lug 235 and thus from toggle link 293. Portion 202 on becoming disengaged from lug 235 escapes latch 293, thus permitting the toggle printing mechanism to respond to the action of a printing spring 236, thereby bringing toggle lever 201 ag-ainst limiting stop 231 of a pair of limiting stops 231 and 238. In the course of the movement of the toggle printing mechanism the platen 2 E3 is raised against type wheel |99 to effect printing upon a tape 239 and then is lowered to permit the continued rotation of type wheel |94 and shaft |15. During the printing movement of printing arm 2H, projection 2|4 coacts with a notch in star wheel |85 to arrest the type wheel |84 momentarily while printing is effected.

When the toggle printing mechanism responds to the action of spring 236, the member 2| 9 is also carried toward the left (as viewed in Fig. 9) to bring the offset portion 222 thereof into position preparatory to effect the restoration or return of the toggle printing mechanism to its position shown in Fig. 9 through the coaction of a lug |90 and shoulder 222 which occurs near the end of the cycle of rotation of disc |39, and therefore of shaft |15. When this happens, lug |90 carries member 219 rightwardly until latch 203 reengages portion 292 on arm |91, and then lug 99 slips off of shoulder 222 after having completed the restoration function and stops at the vposition indicated in Fig. 9. In progress of resetting of toggle members 206 and 291, the stabber 2 lli and the platen 2 I3 are operated into and then out of their printing positions, but during that operating condition, a toothless arc 2l8 is presented to the stabber 2M by the star Wheel |85 so that the star Wheel is not stopped, and a typeless arc (not shown) is presented to the tape 239 and tc platen 2l3 by type wheel 184, so that the tape, though moved toward the type wheel, is not marked.

As the shaft rotates, like motion is also imparted to tape feed cam 223 which rotates tape feed bell crank lever 224 in a counterclock- Wise direction to store up energy in spring 228, so that immediately prior to the arrestment of lug 28H by arm l99, lever 224 will drop off the high part of cam 223 and respond to the pull of spring 228 to actuate through pawl 226 the tape feed ratchet 221 and effect through rollers 232 and 234 the spacing of the tape.

Although the present invention has been disclosed in connection With certain specific embodiments thereof, it is understood that such embodiments are merely illustrative and not restrictive and that all forms coming Within the scope of equivalency of the appended claims are intended to be covered by the invention.

What is claimed is:

l. In a printing telegraph receiver, a startstop shaft, a normally energized magnet, a printing means, means responsive to the deenergization of said magnet for releasing said shaft for rotation, and means effective upon the reenergization of said magnet for controlling the operation of said printing means.

2. In a printing telegraph receiver, a single magnet responsive to monopulse isochronous code signals comprising two elements in which each element occurs but once in a code signal, each element in the code signal being the chronological complement of the other element, printing means, and means responsive to said magnet on the transition from one to the other of said elements to effect the operation of said printing means.

3. In a printing telegraph receiver, a single magnet responsive to equal length code signals comprising two complementary elements of different nature, a printing means, means effective upon the receipt of one of said elements for preparing said means for action, and means effective upon the transition from said one to the other of said elements to consummate the action of said printing means.

4. In a printing telegraph receiver, a start-stop shaft, printing means, a single magnet responsive to equal length code signals comprising tWo complementary elements of diierent nature, means effective upon the receipt of one-of `said elements for initiating the rotation of said shaft, and means effective upon the transition from one to the other of said elements to effect initially the operation of said printing means and subsequently the arrestment of said shaft.

5. In a printing telegraph receiver, a single magnet responsive to equal length code signals, each signal comprising a first condition and a second condition of complementary periodic lengths, printing means, and means responsive to said magnet on the transition from said iirst to said second condition to eiect the operation of said printing means.

6. In a printing telegraph receiver, a start-stop shaft, printing means, a single magnet responsive to equal length code signals, each signal comprising a start condition and a stop condition of complementary periodic lengths, means responsive to the start condition of a signal for initiating the rotation of said shaft, and means responsive to said magnet on the transition from start to stop condition to effect the operation of said printing means.

7. In a printing telegraph receiver, a startstop shaft, printing means, a single magnet responsive to equal length code signals, each signal comprising a start condition and a stop condition of complementary periodic lengths, means responsive to the start condition of a signal for initiating the rotation of said shaft, and means responsive to the transition from start to stop condition to eect initially the operation of said printing means and subsequently the arrestment of said shaft. I

8.' In a printing telegraph receiver, a single magnet responsive to equal length code signals,A

each signal comprising a first condition and a second condition of complementary periodic lengths, printing means, spacing means, and single means responsive to the transition from said rst to said second condition to effect simultaneously the operation of both of said means.

9. In a recorder, a start-stop shaft, recording means, a single magnet responsive to equal length code signals, each signal comprising a first condition and a second condition of complementary periodic lengths, means comprising a first element and a second element resiliently connected to each other, means responsive to said first condition to cause said first element to initiate the rotation of said shaft, and means responsive to the transition from said iirst to said second condition to effect, through said elements, initially the operation of said recording means and subsequently the arrestment of said shaft.

10. In a recorder, a single magnet responsive to equal length code signals, each signal comprising a rst condition and a second condition of complementary periodic lengths, recording means, indexing means for said recording means, means responsive to said first condition for preparing said recording means for action, and means effective upon the transition from said first to said second condition to release vsaid recording means for action under the control of said indexing means.

11. In a recorder, a single magnet responsive to equal length code signals, each signal comprising a iirst condition and a second condition of complementary periodic lengths, means controlled by said magnet, recording means provided With a latch means having a first component and a second component adapted to be controlled by said magnet-controlled means, and means responsive to said first condition to render said magnet-controlled means cooperable With said first component to prepare -said recording means for action, said magnet-controlled means operable in response to the transition from said first to said second condition to overcome the influence of said last recited means to cause the disengagement of said first component from said magnetcontrolled means, and to escape said second component to release said recording means for action.

12. In a recorder, a single magnet responsive to equal length code signals, each signal comprising a first condition and a second condition trolled by said magnet-controlled means, means v responsive to said first condition to render said magnet-controlled means cooperable with said latch to prepare said recording means for action, and means operative pursuant to the effect of the transition from said first and said second condition on said magnet-controlled means to establish, through the cooperable relationship between said magnet-controlled means and said latch, the effectiveness of said recording means.

i3. In a printing telegraph receiver, a single magnet responsive to equal length code signals, each signal comprising a first condition and a second condition of complementary periodic lengths, printing means, a start-stop shaft, control means for said shaft, means effective in response to the first condition for actuating said printing means to establish a first predetermined condition in said control means, and means effective upon the transition from said first to said second condition to establish through said printing means a second predetermined condition in said control means.

14. In a printing telegraph receiver, a single magnet responsive to equal length code signals, each signal comprising a first condition and a second condition of complementary periodic lengths, printing means, spacing means, a startstop shaft, control means for said shaft, means effective in response to the first condition for actuating said printing means to establish a first predetermined condition in said control means, and means effective upon the transition from said first to said second condition to establish through said printing means a second predetermined condition in said control means and to effect simultaneously the operation of said spacing means.

15. In a recorder, a start-stop shaft, printing means, a single magnet responsive to electrical signalling conditions for controlling said printing means, and means controlled by said printing means for controlling said shaft.

16. In a printing telegraph receiver, a startstop shaft, a type wheel carried on said shaft, means responsive to the first portion of a received signal for starting said shaft, and means responsive to the second portion of said received signal for printing a selected character from said type Wheel.

17. In a printing telegraph receiver, a startstop shaft having a normal position of arrest,

va type wheel carried on said shaft, means responsive to the firstportion of a received signal for starting said shaft, and means responsive to the second portion of said received signal for printing from said type Wheel while said shaft is out of its normal position.

18. In a printing telegraph receiver, a startstop shaft, means responsive to the first portion of a received signal for starting said shaft and responsive to the second portion of said received signal for restoring stop conditions for said shaft, and printing means responsive to said second portion of said received signal through operation of said first means.

19. In a printing telegraph receiver, a startstop shaft, means responsive to the rst portion of a received signal for starting said shaft and responsive to the second portion of said received signal for restoring stop conditions for said shaft, a type wheel on said shaft, and a printing hammer operable by said first means in response to said second portion of said received signal.

2G. In a printing telegraph receiver, a startstop shaft, means responsive to a first received signal for starting said shaft and responsive to a second received signal for restoring stop conditions for said shaft, a type wheel on said shaft, a

spring-propelled printingl hammer, a cam on. said shaft for setting said hammer into its spring tensioned position, and a latch for said hammer operable to unlatch said hammer in response to said second signal through operation of said first means.

2l. In a printing telegraph receiver, a startstop shaft, means responsive to a first received signal for starting said shaft and responsive to a second received signal for restoring stop conditions for said shaft, type wheel on said shaft, a spring-propelled printing hammer, a cam driven by said shaft for setting said hammer into its spring tensioned position, and a latch for said hammer operable to unlatch said hammer in response to said second signal through operation of said first means.

22. In a printing telegraph receiver, a startstop s-haft, a printing wheel on said shaft, printing means for printing from said wheel while said shaft is in motion, means for stopping said Wheel momentarily during printing, and a resilient connection between said shaft and said wheel permitting stopping of' said wheel while said shaft is in motion.

23. In a printing telegraph receiver, a startstop shaft, a printing wheel on said shaft, printing means for printing from said wheel While said shaft is in motion, and clutch means between said Wheel and said shaft for enabling the stopping of said wheel for printing while said shaft is in motion. l

24. In a printing telegraph receiver, a startstop member, a printing wheel rotatable by said member, printing means for printing from said wheel while said start-stop member is in inotion, means for stopping said wheel momentarily during printing, and a resilient connection between said start-stop member and said wheel permitting stopping of said Wheel while said startstop member is in motion.

25. In a printing telegraph receiver, printing means comprising a single magnet responsive to two line signals to print a character, a startstop shaft, control means for said shaft, means controlled by the operation of said printing means in response to a rst signal to establish a first control condition in said control means, and means controlled by the operation of said printing means in response to a second signal to establish a second control condition in said control means.

26. In a printing telegraph receiver, printing means comprising a single magnet responsive to equal length code signals, each signal comprising a rst condition and a second condition of complementary periodic lengths, a start-stop shaft, control means for said shaft, an assembly comprising a first part and a second part resiliently interconnected, means effective in response to the first condition to establish through said first part a first predetermined condition in said control means and te prepare through said second part the printing means for action, and means effective upon the transition from said first to said second condition to establish through said first part a second predetermined condition in said control means and to effect through said second part the printing operation.

2'7. In a printing telegraph receiver, a shaft, a magnet, mechanically compelled printing means, and means controlled by said magnet for releasing said shaft for rotation and simultaneously preparing said printing means for effective operation and subsequently effective under control of said magnet for compelling the operation of said printing means to consummate the printing function.

28. In a printing telegraph receiver, a startstop shaft, a normally energized magnet, mechanically compelled printing means, means responsive to the deenergization of said magnet for releasing said shaft for rotation, and means effective upon the reenergization of said magnet for compelling the operation of said printing means.

29. In a printing telegraph receiver, a single magnet responsive to equal length code signals comprising two complementary'elements of different nature, mechanically compelling printing means, means effective upon the receipt of one of said elements for preparing said means for action, and means effective upon the transition from one to the other of said elements to compel theconsummate action of said printing means,

30. In a printing telegraph receiver, a single magnet responsive to equal length code signals, each signal comprising a first condition and a second condition of complementary periodic lengths, mechanically compelled printing means, and means responsive to the transition from said first to said second condition to compel the operation of said printing means.

31. In a recorder, a start-stop shaft, printing means, a single magnet responsive to received signaling conditions for controlling said printing means, means controlled by said printing means for controlling said shaft, and means for effecting the adjustment of said last recited means to secure the proper orientation of said shaft with the received signaling conditions.

32. In aprinting telegraph receiver, printing means comprising a single magnet responsive to two line signals to print a character, a startstop shaft, control means for said shaft, means controlled by the operation of said printing means in response t0 a rst signal to establish a first control condition in said control means, means controlled by the operation of said printing means in response to a second signal to establish a second control condition in said control means, and means for effecting the adjustment of said control means to secure the proper orientation of said shaft with said line signals.

` 33. In a printing telegraph receiver, printing means operable through successive selective positions, a signal receiving magnet and armature, means responsive to one movement of said armature to initiate operation of said printing means, and means responsive to a reverse movement of said armature to control said printing means to print.

34. In a printing telegraph receiver, printing means operable at uniform speed through successive selective positions, a signal receiving magnet and armature, means responsive to one movement of said armature to initiate operation of said printing means, and means responsive to a reverse movement of said armature to control said printing means to print.

ALBERT I-I. REIBER. 

